Method of producing colored pictures and sound films



aw it-am 15 894.1-

- UNITED STAT-ES PATENT OFFICE v 1,155,894 mernon or rnonnomc COLOREDPro.-

- romisannsounnmms,

Bla Gispiir, Brussels, Belgiurn No Drawing. -Appiication April 5, 1938,Serial No. 200,218. In Germany June 15, 1933' 3 Claims. '(c 95-.2)

This invention relates to a method of making sired normal density. Theexcessive density may colored movie filmshaving a black and white beobtained by excessive exposure or by excessive sound record, moreparticularly a sound record development of the sound image, or by bothwhich comprises a metallic deposit image, and is methods combined. Onemay thereby obtain a c a continuation-in-part of my prior applicationsound record which, despite subsequent weaken- 5 Serial No. 730,259,filed June 12, 1934. ing arising from later treatment of the film, isSuch a black and white sound record is preferstilladequate to permitproper reproduction of able in many respects to a sound record having asound.. r sound image in some particular color because it is The blackand white sound record maybe provery diflicult to reproduce theblackening curve ,duced as a pure black silver image, or the samewithout distortion, by a colored sound record. may be colored, or, ifpreviously colored, it may This is especially true in connection withsobe allowed to remain in colors. called variable intensity recording.Furthermore, The colored film may be produced as desired.

a sound image in a particular color requires a Thus, for example, theremay be used the well-- photoelectric cell sensitive to a particularcolknown mordanting process, in which the silver 15 ored'light in orderto reproduce it and a black image is first converted into a'mordant,such as --and white record can be reproduced by-any phosilverthiocyanate or silver ferro'cyanide, wheretoelectric cell. However,known processes for upon coloring is performed with a suitabledyecombining a colored picture image and a black stuif. In this caseafter the coloring of the siland white sound record presentthevdifiiculty oi ver salts which act as a moment for the dye- 20.

being unusually complicated because of various stufi, the sound portionof the film will be tre. ted factors,,such as necessity for localtreatment of withideveloper which reduces the'silver salt to the soundtrack, covering the sound track with silver, and a silver sound recordcomprising both 'a. resist or a protective coating during certain blacksilver and dyestufi' will be obtained. If i steps in the process ofmaking the colored picthe sound track is treated with a sodium'hydro- 25ture portion, etc. sulphite solution, a pure black silver sound image Itis therefore an object of this invention to will" be obtained adjacentto the colored image provide am improved method or easily. and portion.cheaply making a colored film'having a black and The process accordingto the invention is par- I white sound record. 4 ticularly suitable inconjunction with the proc- 30 I have discovered that most of theprocesses esses which I have-described in my prior Patutilized in theproduction of colored film involvout No. 1,985,344, December 25, 1934,and my ing the intermediate production of a metallic deprior Patent No.2,025,658, December-24, 1935. posit image include a treatment whichweakens According to the Patent No. 1,985,344, there and hencedeteriorates the quality of the metallic is employed a film materialcomprising three 35 deposit image. In those processes where themedifierently colored and difierently sensitized laytallic deposit image.is ultimately removed, such ers poured one on to the other andcomposed, deterioration causes no difiiculty. 0n the other for example,as follows: hand, when the fi1m carries a'metallic deposit j .40seimdirecord which it is desired to preserve, and

Sensitization 40 both the picture and sound portion of the-film 0 1 aregiven common treatment, this weakening of e v la er the sound .,recordresults in a decrease in the v y r I quality of sound-reprodu ti n. i

It is therefore a further object pf my inven-' tion to obviate thisdifiiculty by an improved I method of shaking a colored film having ame-' I tallic deposit sound record; The picture *portion is copied intothe single In accordance with invention I make the layers in the knownfashion by the use of mas- 5o metallic deposit image in the sound track"of exter positives, which correspond to the negative cessive densityprior to any treatment which may color selection pictures. For copyingthe sound cause a weakening of the record. As a result, record,.layersIII and II, :for example, are exthe excess density compensates for thesubseposed diiiu'sely, and layer I is exposed-behind a quent weakeningof the image and a resultant sound'negative with infra-red light,copying besound record is produced which possesses the deing performedto such an extent that the layer 55 sound image when developed will begreater than the requisitedensityinthefinishedfilm. Actually thisinitial density is increased by approximately 40%.

Instead of overexposinglayerltoobtaina sound image or greater thannormal density, I

Parts Water 100 'I'hiocarbamide .l c t m-id 2 the dyestufl then beingdestroyed at the points of the silver deposit and maintained at thepoints which are free of silver. Finally, the silver deposit in thepicture portion of the film is dissolved out with the aid of a suitablesilver solvent, such as Farmers reducer.

The film now possesses in the picture portion a pure dyestufi image, andinthe sound portion a metallic silver sound record on a bluegreenbackground. If it is desired to have a pure silver image in the soundarea or the film, the sound record is treated with a dyestufifdestroying agent for example with sodium hydrosulphite, titaniumtrichloride, tin chloride, etc.', possibly with the addition ofaccelerating agents such as acids or indulin scarlet. The degree ofdecolorization may be made to vary. If desired, the color'in the soundarea or the film may be reduced or destroyed only to such extent as maybe necessary to permit of aproper reproduction. These difiuse dyestufldestroying agents for treatment of the sound record may 'be used at anysuitable time during the process oi converting the picture portion 01'the metallic deposit film into a. color film. Thus, for example,following the dyeing process or after the dye destroying operationperformed to produce the colored image.

In those cases in which a film is colored with a number of colorsresulting in subtractive black, as is the case in the above example, itwill be found suflicient to remove from the sound record merely one orthe colors, for instance the color abwrbing the rays which are mosteifective on the reproducing cell.

Instead of employing layers to which the dye-f stufi is previouslyapplied, 1. e., predyedlayers, these layers may also be coloredattenexposure. For example, one may use dyestufl-Iorming substances,such as leuco-esters or amines. Azo dyer atufls mayalsobeproducedinthefilminthe same fashion. 4

Processes of this nature are described, for example, in my Patent No.2,071,688, February 23, 1937. The dyestufi is iormed-diflusely, and thendestroyed locally. Alternatively the dyestufliorming substance may bedestroyed locally and the remaining substance then converted into ayestufl.

While I have described my improved process by reference to a particularadaptation, it will be compensate for 7 almost I'is over whereby thedensity of the imderstood that this is only exemplary. my improvedmethod-is applicable to all known methods for the production of coloredpicture and sound films, even though the film includes one or morelayers on one or on both sides 01' the backing or support, and I intendto include all modifications which come within the scope of my inventioas set forth in the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A method of producing combined colored picture. and sound filmsincluding a picture portion and a sound track wherein the sound imagecomprises a metallic deposit, which comprises forming a metallic imagein the picture portion of said film of normal density and forming ametallic sound image in the sound track of greater density than thatrequired in the finished film or adequate sound reproduction, andsubsequently treating the whole film to convert the metallic pictureportion to a color image and to thereby form a normal density metallicsound image.

- 2. A method of producing combined colored picture and sound filmsincluding a picture portion and a sound track wherein the sound imagecomprises a metallic deposit, which comprises forming a metallic imagein the picture portion of said film by normal exposure and forming ametallic sound image in the sound track of greater density than thatrequired in the finished film for adequate sound reproduction: byover-ex posure, and subsequently treating the whole film to convert themetallic image in said picture portion to a colored image by means of anagent which decreases the density of said metallic images, saidover-exposure in said sound track being so regulated as toincrease thedensity of said metallic sound image sufiiciently to compensate for thedecrease in density of said metallic sound. image during treatment ofsaid film to 3. A method of producing combinedcolored picture and soundfilms including a picture portion and a sound track wherein the soundimage comprises a metallic deposit, which comprises forming a metallicimage in the picture portion of said film by, normal development andIorming a metallic sound image in the sound track or greater densitythan that required in the finished film for adequate sound reproductionby overdevelopment and subsequently treating the whole film to convertthe metallic image in said picture portion to a colored image by meansof an agent which decreases the density of said metallic images, saidover-development in said sound track being so regulated as to increasethe density of said metallic sound image sufiiciently to metallic soundimage during treatment of said film to convert the metallic image in thepicture portion to a color image and to thereby form a normal densitymetallic sound image.

the decrease in density of. said

